Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = hl/k

RN = ρ V l /μ

RN = μ cp/k

RN = V²/t.cp

RN = hl/k

RN = ρ V l /μ

RN = μ cp/k

RN = V²/t.cp

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Heat and Mass Transfer
The emissivity for a black body is

1

0.75

0.5

1

0.75

0.5

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Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = S/ρk

h = kρ/S

h = k/ ρS

h = ρS/k

h = S/ρk

h = kρ/S

h = k/ ρS

h = ρS/k

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

None of these

Emissive power

Emissivity

Absorptive power

None of these

Emissive power

Emissivity

Absorptive power

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Heat and Mass Transfer
The time constant of a thermocouple is

Determined by the time taken to reach 100°C from 0°C

The time taken to attain 50% of the value of initial temperature difference

The time taken to attain 63.2% of the value of initial temperature difference

The time taken to attain the final temperature to be measured

Determined by the time taken to reach 100°C from 0°C

The time taken to attain 50% of the value of initial temperature difference

The time taken to attain 63.2% of the value of initial temperature difference

The time taken to attain the final temperature to be measured

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Heat and Mass Transfer
According of Kirchhoff's law

Emissive power and absorptivity are constant for all bodies

Radiant heat is proportional to fourth power of absolute temperature

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

Emissive power depends on temperature

Emissive power and absorptivity are constant for all bodies

Radiant heat is proportional to fourth power of absolute temperature

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

Emissive power depends on temperature

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Heat and Mass Transfer

Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer The emissivity for a black body is

Heat and Mass Transfer Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

Heat and Mass Transfer If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Heat and Mass Transfer The time constant of a thermocouple is

Heat and Mass Transfer According of Kirchhoff's law

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
The emissivity for a black body is

Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Heat and Mass Transfer
The time constant of a thermocouple is

Heat and Mass Transfer
According of Kirchhoff's law